大直径土压平衡盾构掘进参数对比试验研究

发布时间：2018-10-31 11:52

【摘要】：本文以深圳地铁11号线南山站~前海湾站区间、车公庙~红树湾区间的盾构施工为工程背景,简要介绍由中铁装备公司生产的国内首创7m大直径土压盾构的设计技术参数,并针对两个区间的盾构掘进中遇到的砾质黏性土、全风化花岗石两种地层,对比分析在相同地层下,不同掘进参数的实际应用效果。在砾质黏性土地层中,推进压力较大,刀盘转速波动较大,盾构刀盘的扭矩会显著增大,螺机转速要及时调整,保持土仓压力基本稳定。在全风化花岗石地层中,盾构推进压力基本相同,刀盘转速较大,刀盘扭矩也较大,注浆压力、螺机转速基本相同,车红区间的土仓压力控制的较好。车红区间的地表沉降基本控制在40mm,车红区间的掘进效率在砾质黏性土地层中与南前区间相差不多,在全风化花岗石地层中要高很多,掘进和管片拼装时间的合理分配,有效提高了掘进效率。
[Abstract]:Taking the shield construction between Nanshan Station and Deep Bay Station of Shenzhen Metro Line 11 as the engineering background, this paper briefly introduces the design technical parameters of the 7m large diameter earth pressure shield machine produced by China Railway equipment Company. Aiming at the gravel clay and fully weathered granite strata encountered in shield tunneling in two sections, the practical application effects of different tunneling parameters in the same stratum are analyzed comparatively. In the gravelly clay layer, the propelling pressure is large, the speed of the cutter head fluctuates greatly, the torque of the shield cutter will increase significantly, the rotation speed of the screw machine should be adjusted in time, and the pressure of the earth bin should be kept basically stable. In the fully weathered granite formation, the pressure of shield tunneling is basically the same, the rotary speed of cutter head is larger, the torque of cutter head is also larger, the grouting pressure and the rotation speed of screw machine are basically the same, and the earth bin pressure in Che-Hong section is well controlled. The surface subsidence of the Che-Hong section is basically controlled at 40mm. The driving efficiency of the Che-hong section is not much different from that of the former section in the gravelly clay layer, and it is much higher in the weathered granite strata, and the reasonable allocation of the excavation and segment assembling time is achieved. Effectively improve the tunneling efficiency.
【作者单位】：北京交通大学;
【基金】：国家973计划项目课题(2014CB046906)
【分类号】：U455.43

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